package com.yongnuo.remoteconlight.util;

import android.annotation.TargetApi;
import android.app.Activity;
import android.os.Build;
import android.view.View;
import android.view.WindowManager;

/**
 * An API 11+ implementation of {@link SystemUiHider}. Uses APIs available in
 * Honeycomb and later (specifically {@link View#setSystemUiVisibility(int)}) to
 * show and hide the system UI.
 */
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class SystemUiHiderHoneycomb extends SystemUiHiderBase {
    /**
     * Flags for {@link View#setSystemUiVisibility(int)} to use when showing the
     * system UI.
     */
    private int mShowFlags;

    /**
     * Flags for {@link View#setSystemUiVisibility(int)} to use when hiding the
     * system UI.
     */
    private int mHideFlags;

    /**
     * Flags to test against the first parameter in
     * {@link android.view.View.OnSystemUiVisibilityChangeListener#onSystemUiVisibilityChange(int)}
     * to determine the system UI visibility state.
     */
    private int mTestFlags;

    /**
     * Whether or not the system UI is currently visible. This is cached from
     * {@link android.view.View.OnSystemUiVisibilityChangeListener}.
     */
    private boolean mVisible = true;

    /**
     * Constructor not intended to be called by clients. Use
     * {@link SystemUiHider#getInstance} to obtain an instance.
     */
    protected SystemUiHiderHoneycomb(Activity activity, View anchorView,
	    int flags) {
	super(activity, anchorView, flags);

	mShowFlags = View.SYSTEM_UI_FLAG_VISIBLE;
	mHideFlags = View.SYSTEM_UI_FLAG_LOW_PROFILE;
	mTestFlags = View.SYSTEM_UI_FLAG_LOW_PROFILE;

	if ((mFlags & FLAG_FULLSCREEN) != 0) {
	    // If the client requested fullscreen, add flags relevant to hiding
	    // the status bar. Note that some of these constants are new as of
	    // API 16 (Jelly Bean). It is safe to use them, as they are inlined
	    // at compile-time and do nothing on pre-Jelly Bean devices.
	    mShowFlags |= View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
	    mHideFlags |= View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
		    | View.SYSTEM_UI_FLAG_FULLSCREEN;
	}

	if ((mFlags & FLAG_HIDE_NAVIGATION) != 0) {
	    // If the client requested hiding navigation, add relevant flags.
	    mShowFlags |= View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION;
	    mHideFlags |= View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
		    | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
	    mTestFlags |= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
	}
    }

    /** {@inheritDoc} */
    @Override
    public void setup() {
	mAnchorView
		.setOnSystemUiVisibilityChangeListener(mSystemUiVisibilityChangeListener);
    }

    /** {@inheritDoc} */
    @Override
    public void hide() {
	mAnchorView.setSystemUiVisibility(mHideFlags);
    }

    /** {@inheritDoc} */
    @Override
    public void show() {
	mAnchorView.setSystemUiVisibility(mShowFlags);
    }

    /** {@inheritDoc} */
    @Override
    public boolean isVisible() {
	return mVisible;
    }

    private View.OnSystemUiVisibilityChangeListener mSystemUiVisibilityChangeListener = new View.OnSystemUiVisibilityChangeListener() {
	@Override
	public void onSystemUiVisibilityChange(int vis) {
	    // Test against mTestFlags to see if the system UI is visible.
	    if ((vis & mTestFlags) != 0) {
		if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
		    // Pre-Jelly Bean, we must manually hide the action bar
		    // and use the old window flags API.
		    mActivity.getActionBar().hide();
		    mActivity.getWindow().setFlags(
			    WindowManager.LayoutParams.FLAG_FULLSCREEN,
			    WindowManager.LayoutParams.FLAG_FULLSCREEN);
		}

		// Trigger the registered listener and cache the visibility
		// state.
		mOnVisibilityChangeListener.onVisibilityChange(false);
		mVisible = false;

	    } else {
		mAnchorView.setSystemUiVisibility(mShowFlags);
		if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
		    // Pre-Jelly Bean, we must manually show the action bar
		    // and use the old window flags API.
		    mActivity.getActionBar().show();
		    mActivity.getWindow().setFlags(0,
			    WindowManager.LayoutParams.FLAG_FULLSCREEN);
		}

		// Trigger the registered listener and cache the visibility
		// state.
		mOnVisibilityChangeListener.onVisibilityChange(true);
		mVisible = true;
	    }
	}
    };
}
